block_header_t Struct Reference

Represents the header for a memory block. More...

Collaboration diagram for block_header_t:

Public Attributes
uintptr_t	magic
size_t	size
uint32_t	free
uint32_t	marked
const char *	file
uint64_t	line
uintptr_t	canary
struct BlockHeader *	next
struct BlockHeader *	prev
struct BlockHeader *	fl_next
struct BlockHeader *	fl_prev

Detailed Description

Represents the header for a memory block.

This structure manages metadata for each block within the heap, including size, status, and debugging information.

Fields:

• magic – Magic number for integrity check
• size – Total block size (includes header, data, and canary)
• free – 1 if block is free, 0 if allocated
• marked – Garbage collector mark flag
• file – Source file of allocation (for debugging)
• line – Line number of allocation (for debugging)
• canary – Canary value for buffer-overflow detection
• next – Pointer to the next block
• prev – Pointer to the previous block
• fl_next – Pointer to the next block on free list
• fl_prev – Pointer to the previous block on free list

Member Data Documentation

canary

uintptr_t block_header_t::canary

Canary value for buffer-overflow detection

file

const char* block_header_t::file

Source file of allocation (for debugging)

fl_next

struct BlockHeader* block_header_t::fl_next

Pointer to the next block on free list

fl_prev

struct BlockHeader* block_header_t::fl_prev

Pointer to the previous block on free list

free

uint32_t block_header_t::free

1 if block is free, 0 if allocated

line

uint64_t block_header_t::line

Line number of allocation (for debugging)

magic

uintptr_t block_header_t::magic

Magic number for integrity check

marked

uint32_t block_header_t::marked

Garbage collector mark flag

next

struct BlockHeader* block_header_t::next

Pointer to the next block

prev

struct BlockHeader* block_header_t::prev

Pointer to the previous block

size

size_t block_header_t::size

Total block size (includes header, data, and canary)

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The documentation for this struct was generated from the following file:

• src/libmemalloc.c